Mingjun Li, Xuesen Chen, Pingping Wang and Fengwang Ma

or non-renewable oxalicacid and/or tartaric acid and then lost ( Debolt et al., 2007 ). Thus, DHAR is important to maintaining AsA levels and redox status. We found no clear relationship among AsA concentration, DHAR activity, and the mRNA expression

sterile sand and brought up to 50 mL with 2% oxalicacid. The sample was clarified by centrifuging at 4000 rpm for 10 min at 4 °C (Eppendorf 5810R; Haupauge, NY), and 5 mL of the supernatant was titrated with 0.2 mg/mL 2,6-dichlorophenol-indophenol. Two